More reliable sign-out and app connections

Revoked devices and apps lose access immediately.

• Signing out a device in Security now immediately stops it from reading or saving cards.
• Signing out of desktop, CLI, or Raycast revokes that installation’s access. If sign-out fails, you can retry without losing the saved credentials.
• Disconnecting an app or revoking an API key immediately stops its MCP access, including existing connections.